if you didn't figure it out there is an application in the crack folder, put it in the installed directory and replace it with the one that is already in there.

Welp, I'm 4 years too late but, technically "Hentai" means perverted, and hentai anime is perverted anime, so basically you can say that adult visual novel is hentai game (or anything Japanese "Porn" related could be called Hentai something) ,.. Even though, I know that the more correct term in game world is Ero Game (Eroge)